CN112019013A - High-power DCDC anti-impact reverse-connection-prevention slow starting circuit and control method - Google Patents
High-power DCDC anti-impact reverse-connection-prevention slow starting circuit and control method Download PDFInfo
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- CN112019013A CN112019013A CN202010902017.1A CN202010902017A CN112019013A CN 112019013 A CN112019013 A CN 112019013A CN 202010902017 A CN202010902017 A CN 202010902017A CN 112019013 A CN112019013 A CN 112019013A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/30—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells
- B60L58/31—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells for starting of fuel cells
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/40—Application of hydrogen technology to transportation, e.g. using fuel cells
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
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- Sustainable Energy (AREA)
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- Mechanical Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention relates to high-power DCDC anti-impact and anti-reverse-connection slow start control.A circuit for preventing impact and reverse-connection, which comprises a diode, a power resistor and a relay, is respectively arranged at an input side and an output side, and an input filter capacitor and an output filter capacitor start to charge after an input end wiring is correctly connected with a power supply; along with the rise of the voltage of the input filter capacitor, the auxiliary power supply starts to work, and the input side relay K1 is closed after the sampling voltage value of the positive voltage end of the input filter capacitor reaches a set value; detecting the polarity of a positive-voltage port of the anti-impact and anti-reverse-connection circuit at the output end, wherein when the polarity is negative, the relay at the output end is not closed and no output voltage exists; when the voltage is positive, the high-voltage battery pack charges the output filter capacitor through the output end anti-impact and anti-reverse-connection circuit, and when the voltage of the positive voltage end of the output filter capacitor is approximately equal to the voltage of the positive voltage port of the output end anti-impact and anti-reverse-connection circuit, the relay K2 is closed, the MOS tube is conducted, and the high-power DCDC starts to output voltage.
Description
Technical Field
The invention relates to the field of high-power vehicle-mounted power supplies of fuel cell electric automobiles, in particular to a high-power DCDC anti-impact reverse-connection-prevention slow starting circuit and a control method.
Background
In the input and output of a high-power switching power supply, a large-capacity electrolytic capacitor filter circuit is usually used, which causes two problems in the circuit:
the first problem is that: at the input end, the filter circuit causes a great instantaneous current at the moment of starting up due to large capacitance capacity, and in order to reduce the damage of an impact current generated by a power supply at the moment of starting up to a key device and protect power supply equipment and a working circuit, a common technical means is to add a circuit mainly composed of an NTC thermistor at the primary side of the power supply to absorb the impact current peak at the moment of starting up; or the method of using a relay parallel resistance to restrain the impact current. The impact current generated at the moment of starting up can be consumed on NTC or the parallel resistor of the relay, thereby achieving the purpose of reducing the impact current generated at the moment of starting up. For the former scheme, the NTC current impact preventing circuit is connected in series with the input bus circuit, and when the power supply works normally, current continuously flows through the NTC circuit, so that the NTC circuit has little power loss, thereby affecting the overall conversion efficiency and high-temperature performance of the power supply; and under the high temperature condition, the resistance of the NTC can be influenced by the temperature, so that the current impact resistance of the circuit is greatly weakened. In the traditional mode of adopting a relay parallel resistor, only simple pre-charging protection can be carried out, and the function of preventing reverse connection cannot be simultaneously achieved.
The second problem is that: at the output, owing to used the output filter capacitor of large capacity, in order to avoid switching power supply to appear the start-up protection when charging for output capacitor in the twinkling of an eye of starting to also can form big impulse current in the power inside, can do the slow start function to the power usually, let the slow rise of voltage of output, be unlikely to that output inner circuit forms too big impulse current. In the prior art, the slow start technology is solved by adopting either a pure hardware structure or pure software control, and the start output voltage establishment completion time of the switching power supply is increased, so that the timeliness of the power supply work is influenced, namely the start time of the power supply is influenced.
Disclosure of Invention
The invention discloses a high-power DCDC anti-impact and anti-reverse-connection slow start circuit, which adopts a simple circuit structure design, realizes the purposes of preventing current impact and reverse connection of an input end and an output end by combining and controlling software and hardware, can effectively reduce the slow start time of a power supply, improves the timeliness of the power supply, and has simple and reliable whole control strategy.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the high-power DCDC anti-impact anti-reverse connection slow starting circuit comprises a high-power DCDC, a voltage detection unit and a control circuit, wherein the input end of the high-power DCDC is connected with a fuel cell stack, the output end of the high-power DCDC is connected with a high-voltage battery pack, and the input side and the output side of the high-power DCDC are respectively provided with an anti-impact anti-reverse connection circuit; the anti-impact and anti-reverse-connection circuit comprises a diode, a power resistor and a relay, wherein the diode is connected with the power resistor in series and then connected to one side of the relay in parallel; the anti-impact and anti-reverse-connection circuit on the input side is connected with the high-power DCDC input positive voltage end, and the anode of the diode is connected with the high-power DCDC input positive voltage end; the anti-impact and anti-reverse-connection circuit on the output side is connected with the high-power DCDC output positive voltage end, and the anode of the diode is connected with the high-power DCDC output positive voltage end; the high-power DCDC comprises an auxiliary power supply for supplying power to a relay, an input filter capacitor C1, an output filter capacitor C2, diodes D2 and D3, an inductor L1 and a MOS tube Q1, wherein the diode D3 and the inductor L1 are connected in series and then connected in parallel with the diode D2, the anode of the diode D2 is connected with a positive voltage end on the input side, the cathode of the diode D3 is connected with a positive voltage end on the output side, the drain of the MOS tube Q1 is connected with the anode of the diode D3, and the source is connected with a negative voltage end; the control circuit comprises a relay control circuit and an MOS tube control circuit connected with a grid of an MOS tube Q1, the voltage detection unit comprises an input voltage detection circuit Test1 connected with an input positive voltage end, an output port voltage detection circuit Test2 connected with an anode of a diode in an anti-impact and anti-reverse-connection circuit at the output side, and an output voltage detection circuit Test3 connected with a positive voltage end of an output filter capacitor C2, a sampling voltage value of the Test1 is used for controlling the closing of the input side relay, a high-voltage battery pack charges the positive voltage end of the output filter capacitor C2, the sampling voltage value of the Test2 is compared with the sampling voltage value of the Test3, the relay at the output side is closed when the sampling voltage value is approximately equal or equal, and the MOS tube Q1 is conducted.
The high-power DCDC anti-impact reverse-connection slow start control method comprises the following steps: the input side and the output side of the high-power DCDC are respectively provided with an anti-impact and anti-reverse-connection circuit, the anti-impact and anti-reverse-connection circuit comprises a diode, a power resistor and a relay, and the high-power DCDC comprises an auxiliary power supply, an input filter capacitor, an output filter capacitor and an MOS (metal oxide semiconductor) tube; when the input end of the high-power DCDC is reversely connected, the auxiliary power supply and the relay do not work, and when the high-power DCDC is in an initial state, the relays K1, K2 and the MOS tube are all in a disconnected state;
when the high-power DCDC input end is correctly wired and connected with a power supply, the input filter capacitor and the output filter capacitor start to be charged, the auxiliary power supply starts to work along with the rise of the voltage of the input filter capacitor, and the input side relay K1 is closed after the positive voltage value of the input filter capacitor reaches a set value;
after the auxiliary power supply works, the polarity of a positive-voltage port of the anti-impact and anti-reverse-connection circuit at the output end is detected, if the positive-voltage port is detected to be negative voltage, the polarity is connected reversely, and the output-side relay K2 is not closed and has no output voltage; if positive voltage is detected, the polarity is correct, the high-voltage battery pack charges the output filter capacitor through the output end anti-impact and anti-reverse-connection circuit, the sampling voltage of the positive voltage end of the output filter capacitor is compared with the sampling voltage value of the positive voltage port of the output end anti-impact and anti-reverse-connection circuit, when the sampling voltage value of the positive voltage end of the output filter capacitor is approximately equal to the sampling voltage value of the positive voltage port of the output end anti-impact and anti-reverse-connection circuit, the relay K2 is closed, the MOS tube.
The anti-impact and anti-reverse-connection circuit designed by the invention has a simple structure, is easy to realize and low in cost, can perform current impact prevention and reverse connection prevention protection on the input end and the output end, is realized by combining software and hardware on the design of a power supply slow starting scheme, adopts a two-stage pre-charging structure for charging the output filter capacitor, is pre-charged by the power supply through the input end at one stage, and is pre-charged by the high-voltage battery pack at the second stage, so that the DCDC can directly output corresponding voltage on a voltage platform of the output filter capacitor with two-stage pre-charging, the slow starting process from 0V voltage is avoided, the time for slow starting is reduced, and the timeliness of the power supply is favorably improved.
Drawings
FIG. 1 is a block diagram of a system of anti-impact, anti-reverse connection, slow start circuits according to the present invention;
FIG. 2 is a schematic diagram of the anti-shock reverse-connection-prevention slow start circuit of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The embodiment discloses a high-power DCDC anti-impact reverse connection slow starting circuit and a Control method thereof, and as shown in fig. 1 and fig. 2, the whole circuit comprises a high-power DCDC, a voltage detection unit Test and a Control circuit Control. Power in fig. 1 represents an auxiliary Power supply inside the high-Power DCDC, and mainly supplies Power to the relay, the chip and the like. The Control circuit Control mentioned in this embodiment is divided into three units, wherein Control1 and Control2 are both relay Control circuits, and respectively Control the on/off of the input side relay and the output side relay, and Control3 is a Control circuit of a high-power DCDC internal MOS transistor, and controls the operating state of the MOS transistor. The voltage detection unit Test in this embodiment is also divided into three units, which are an input voltage detection circuit Test1 for acquiring the input side of the high-power DCDC, an output port voltage detection circuit Test2 for acquiring the output side of the anti-impact anti-reverse-connection circuit, and an output voltage detection circuit Test3 for acquiring the positive voltage end of the output filter capacitor. The circuit configuration of the present embodiment will be described in detail below with reference to the drawings.
The input end of the high-power DCDC in the embodiment is connected with the fuel cell stack, the input voltage of the fuel cell stack is used for boosting conversion, the output end of the high-power DCDC is also connected with a high-voltage battery pack, and the high-voltage battery pack is used for carrying out secondary pre-charging on an output filter capacitor C2 in the high-power DCDC. In order to realize the shock protection at the moment of starting the input end and the output end of the high-power DCDC and to realize the reverse connection prevention at the two ends, the input side and the output side of the DCDC are respectively provided with a shock prevention and reverse connection prevention circuit in the embodiment. In order to simplify the circuit design structure and improve the reliability of the circuit, the anti-impact and anti-reverse-connection circuits on both sides in this embodiment are each composed of a diode, a power resistor, and a relay, the diode and the power resistor are connected in series and then connected in parallel to one side of the relay, and the specific connection structure is shown in fig. 2.
The anti-impact and anti-reverse-connection circuit on the input side is connected to a high-power DCDC input positive voltage end IN +, the anode of the diode D1 is connected to an IN + end, the cathode of the diode D1 is connected to the power resistor R1, the other end of the power resistor R1 is connected to the positive voltage end of the input filter capacitor C1, K1 IN the diagram of fig. 2 represents a relay on the input side, and K2 represents a relay on the output side. The anti-impact and anti-reverse-connection circuit on the output side is connected to the positive voltage end OUT + of the high-power DCDC output, the anode of the diode D4 is connected to OUT +, the cathode of the diode D4 is connected to the power resistor R2, and the other end of the power resistor R2 is connected to the positive voltage end of the output filter capacitor C2. The high-Power DCDC comprises an auxiliary Power supply Power for supplying Power to a relay, an input filter capacitor C1, an output filter capacitor C2, diodes D2 and D3, an inductor L1 and a MOS tube Q1, wherein the diode D3 and the inductor L1 are connected IN series and then connected IN parallel with a diode D2, the anode of the diode D2 is connected with the positive voltage end of the input filter capacitor C1, the cathode of the diode D2 is connected with the positive voltage end of the output filter capacitor C2, the cathode of the diode D3 is connected with the positive voltage end of the output filter capacitor C2, the drain of the MOS tube Q1 is connected with the anode of the diode D3, the source is connected with an input negative voltage end IN-, and the gate is connected with a. The sampling voltage value of Test1 is used for controlling the closing of relay K1, the sampling voltage of Test2 is used for judging whether the polarity of the output end is connected reversely, the sampling voltage is also used for comparing with the sampling voltage value of Test3, when the two are approximately equal or equal in size through program setting in the single chip microcomputer, the relay K2 is closed, the MOS tube Q1 is conducted, the approximately equal means approximately equal, and the closer is the better.
The circuit hardware structure not only can realize the impact prevention and reverse connection prevention protection of the input end and the output end of the high-power DCDC, but also can effectively shorten the slow start time by combining software control.
The protection process for preventing the input end from being impacted and reversely connected is as follows: when the positive and negative connection of the input end is reversed, the diode D1 is used for protection by utilizing the one-way conductive characteristic, the auxiliary Power supply does not work, the relay K1 and the DCDC internal chip do not have a Power supply source and cannot work, and reverse connection prevention protection of the input end is formed. When the input end is correctly connected, the power-on relays K1, K2 and the MOS transistor Q1 are all in an off state, at this time, the input filter capacitor C1 is charged through the diode D1 and the power resistor R1, and the output filter capacitor C2 is subjected to primary pre-charging through the diode D1, the power resistor R1 and the diode D2. At this time, only a small current passes through the input end, and the impact current at the moment of starting up is consumed on the power resistor R1, so that the purpose of preventing the current impact at the input end is achieved.
With the charging of the input end, after the voltage of the input filter capacitor C1 rises to a certain voltage value, the auxiliary Power supply Power starts to operate by self-starting, and the voltage detection circuits Test1-Test3 and the Control circuits Control1 and Control2 also start to operate. Test2 begins to detect the polarity of the OUT + end, judges whether the output end is connected reversely, if the detection result is negative voltage, the output end is connected reversely, at this time, the reverse connection preventing circuit formed by diode D4, power resistor R2 and relay K2 plays a role in protection, relay K2 is not attracted, and no voltage is output from the output end. If the detection result is positive voltage, the wiring is correct, the high-voltage battery pack performs secondary pre-charging on the output filter capacitor C2 through the diode D4 and the power resistor R2, the voltage of an output port is further improved, preparation is made for formal work of the power supply, the power supply can be directly started and output from a voltage platform after the two-stage pre-charging, and the time of starting and slow starting is shortened.
When the value of the input voltage detected by Test1 reaches the set value, relay K1 starts to close. When the polarity detected by Test2 is correct, the sampled voltage of Test3 is compared with the sampled voltage of Test2, and when the sampled voltage and the sampled voltage of Test2 are approximately equal or equal, the Control circuit Control2 of the relay K2 starts to operate to close the relay K2, and the MOS tube Control circuit Control3 also starts to operate to turn on the Q1, so that the whole main power supply starts to normally operate the output voltage.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (2)
1. High-power DCDC protecting against shock is prevented joining in reverse and is slowly started circuit, its characterized in that: the high-power direct current (DCDC) power supply comprises a high-power DCDC, a voltage detection unit and a control circuit, wherein the input end of the high-power DCDC is connected with a fuel cell stack, the output end of the high-power DCDC is connected with a high-voltage battery pack, and an anti-impact and anti-reverse-connection circuit is respectively arranged on the input side and the output side of the high-power DCDC; the anti-impact and anti-reverse-connection circuit comprises a diode, a power resistor and a relay, wherein the diode is connected with the power resistor in series and then connected to one side of the relay in parallel; the anti-impact and anti-reverse-connection circuit on the input side is connected with the high-power DCDC input positive voltage end, and the anode of the diode is connected with the high-power DCDC input positive voltage end; the anti-impact and anti-reverse-connection circuit on the output side is connected with the high-power DCDC output positive voltage end, and the anode of the diode is connected with the high-power DCDC output positive voltage end; the high-power DCDC comprises an auxiliary power supply for supplying power to a relay, an input filter capacitor C1, an output filter capacitor C2, diodes D2 and D3, an inductor L1 and a MOS tube Q1, wherein the diode D3 and the inductor L1 are connected in series and then connected in parallel with the diode D2, the anode of the diode D2 is connected with a positive voltage end on the input side, the cathode of the diode D3 is connected with a positive voltage end on the output side, the drain of the MOS tube Q1 is connected with the anode of the diode D3, and the source is connected with a negative voltage end; the control circuit comprises a relay control circuit and an MOS tube control circuit connected with a grid of an MOS tube Q1, the voltage detection unit comprises an input voltage detection circuit Test1 connected with an input positive voltage end, an output port voltage detection circuit Test2 connected with an anode of a diode in an anti-impact and anti-reverse-connection circuit at the output side, and an output voltage detection circuit Test3 connected with a positive voltage end of an output filter capacitor C2, a sampling voltage value of the Test1 is used for controlling the closing of the input side relay, a high-voltage battery pack charges the positive voltage end of the output filter capacitor C2, the sampling voltage value of the Test2 is compared with the sampling voltage value of the Test3, the relay at the output side is closed when the sampling voltage value is approximately equal or equal, and the MOS tube Q1 is conducted.
2. The high-power DCDC anti-impact reverse-connection slow start control method is characterized by comprising the following steps: the input side and the output side of the high-power DCDC are respectively provided with an anti-impact and anti-reverse-connection circuit, the anti-impact and anti-reverse-connection circuit comprises a diode, a power resistor and a relay, and the high-power DCDC comprises an auxiliary power supply, an input filter capacitor, an output filter capacitor and an MOS (metal oxide semiconductor) tube; when the input end of the high-power DCDC is reversely connected, the auxiliary power supply and the relay do not work, and when the high-power DCDC is in an initial state, the relays K1, K2 and the MOS tube are all in a disconnected state;
when the high-power DCDC input end is correctly wired and connected with a power supply, the input filter capacitor and the output filter capacitor start to be charged, the auxiliary power supply starts to work along with the rise of the voltage of the input filter capacitor, and the input side relay K1 is closed after the positive voltage value of the input filter capacitor reaches a set value;
after the auxiliary power supply works, the polarity of a positive-voltage port of the anti-impact and anti-reverse-connection circuit at the output end is detected, if the positive-voltage port is detected to be negative voltage, the polarity is connected reversely, and the output-side relay K2 is not closed and has no output voltage; if positive voltage is detected, the polarity is correct, the high-voltage battery pack charges the output filter capacitor through the output end anti-impact and anti-reverse-connection circuit, the sampling voltage of the positive voltage end of the output filter capacitor is compared with the sampling voltage value of the positive voltage port of the output end anti-impact and anti-reverse-connection circuit, when the sampling voltage value of the positive voltage end of the output filter capacitor is approximately equal to the sampling voltage value of the positive voltage port of the output end anti-impact and anti-reverse-connection circuit, the relay K2 is closed, the MOS tube.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010902017.1A CN112019013A (en) | 2020-09-01 | 2020-09-01 | High-power DCDC anti-impact reverse-connection-prevention slow starting circuit and control method |
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| CN202010902017.1A CN112019013A (en) | 2020-09-01 | 2020-09-01 | High-power DCDC anti-impact reverse-connection-prevention slow starting circuit and control method |
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|---|---|---|---|---|
| EP4354717A1 (en) * | 2022-10-13 | 2024-04-17 | OMRON Corporation | Power converter apparatus |
| CN116111994A (en) * | 2023-02-17 | 2023-05-12 | 湖南博匠信息科技有限公司 | Capacitive load slow power-on circuit, electronic equipment and control method |
| CN116111994B (en) * | 2023-02-17 | 2023-08-18 | 湖南博匠信息科技有限公司 | Capacitive load slow power-on circuit, electronic equipment and control method |
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Application publication date: 20201201 |